Machinery
Four propellers were driven directly by four Parsons turbines. Steam to drive the turbines was produced in fifteen Babcock and Wilcox boilers with a normal working pressure of 235 pounds per square inch (PSI). The designed shaft horse power (SHP) was 26,500, and the expected maximum speed with this power was 21 knots (39 km/h). She could carry up to 2,120 tons of coal and 710 tons of fuel oil; her maximum range was 3,400 nautical miles (6,300 km) at ten knots using coal only, and 5,300 nautical miles (9,800 km) at ten knots using both coal and oil. This radius of action was significantly less than that of contemporary British battleships, but was wholly adequate for operations in the North Sea, where any action against the German High Seas Fleet would be anticipated.
Read more about this topic: HMS Erin (1913)
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